Dziwożona is a female swamp demon in Slavic mythology known for being malicious and dangerous. Most at risk of becoming one of these demons after death were thought to be midwives, old maids, unmarried mothers, pregnant women who die before childbirth, as well as abandoned children born out of wedlock.

A changeling, also historically referred to as an auf or oaf, is a human-like creature found throughout much of European folklore. A changeling was a substitute left by a supernatural being on kidnapping a human being. Sometimes the changeling was a 'stock', more often the changeling was a supernatural being made magically to look like the kidnapped human. Supernatural beings blamed for stealing children included fairies, demons, trolls, nereids and many others. Usually, the kidnapped human was a child; but there were cases, particularly in Scandinavia and Ireland, where adults were taken.